easyui不提交window中的form表单数据

<form id="ff" method="post">
，

    <div id="win" class="easyui-window" title="系统登录" style="width: 345px; height: 180px; padding: 10px" data-options="modal:true,collapsible:false,minimizable:false,maximizable:false,closable:false,resizable:false,draggable:false">
        <div class="easyui-panel" data-options="width:310">
            <p><span class="lbl_R">用户名：</span><input type="text" name="username" class="ipt" /></p>
            <p><span class="lbl_R">密码：</span><input type="text" name="password" class="ipt" /></p>
        </div>
        <div style="margin: 10px auto; text-align: right;">
            <a href="javascript:void(0)" id="login" class="easyui-linkbutton">登录</a>
            <a href="javascript:void(0)" id="reset" class="easyui-linkbutton">重置</a>
        </div>
    </div>
</form>

<div id="win" class="easyui-window" title="系统登录" style="width: 345px; height: 180px; padding: 10px" data-options="modal:true,collapsible:false,minimizable:false,maximizable:false,closable:false,resizable:false,draggable:false">
        <form id="ff" method="post">
        <div class="easyui-panel" data-options="width:310">
            <p><span class="lbl_R">用户名：</span><input type="text" name="username" class="ipt" /></p>
            <p><span class="lbl_R">密码：</span><input type="text" name="password" class="ipt" /></p>
        </div>
        </form>
        <div style="margin: 10px auto; text-align: right;">
            <a href="javascript:void(0)" id="login" class="easyui-linkbutton">登录</a>
            <a href="javascript:void(0)" id="reset" class="easyui-linkbutton">重置</a>
        </div>
    </div>